If you visit on a warm summers day, you are likely to see a beautiful display of butterflies, flitting about between the flowers.
The chalk grassland flora provides the foodplants for the larvae of species such as adonis blue which can be seen on the wing in May into early June and then a second brood at the end of the summer. When freshly emerged the butterfly has a wonderful iridescence.
Marsh fritillary can be seen in late May into June, it has a beautiful chequerboard pattern. The larvae of this butterfly can be seen in tent like webs on its foodplant, devils-bit scabious in late summer.
Other butterflies to look out for are common and small blue and brown argus from the same family and the wall brown which likes basking on bare chalk.
In July look out for the fast flying dark green fritillary and chalkhill blue with its paler blue colour.
More common is marbled white which has a very striking black and white pattern seen in the middle of summer.
Warm, sheltered spots are the best places to look, the coombes of Calstone Down are a very good place to start, as is the steep south facing slope of the west end of Cherhill Down. The ramparts around the Iron Age hill fort also provide a warmer micro-climate for them to flourish.
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